Gas-burning furnace.



- J. E. BELL.

GAS BUBNING 1 11111111013. APPLIGATION FILED MAR. 16, 1909.

6 SHEETS-SHEET 1.

J. E. BELL.

GAS BURNING FURNACE. APPLICATION FILED MAR.15, 1909. 1976 344 Patented Oct. 21, 1913.

6 SHEETSSHEET 2.

WITNESSES: l/Vl/E/IITOR MUMW Xm.%. $%19.

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GAS BURNING FURNACE.

APPLICATION FILED MABJG, 1909.

3L,@76,344, Patefited 0011. 21, 1913.

6 SHEETS-SHEET 3.

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J.E.BELL.

GAS BURNING FURNACE.

. I APPLICATION FILED MAR. 15, 1909 1 07 344 Patented 001;. 21, 1913;

6 SHEETS-SHEET 4.

WITNESSES" I I/Vl/E/VTOR I WW xv). ew. M

J. E. BELL.

GAS BURNING FURNACE.

APPLICATION FILED MAB.15, 1909.

1,076,344. Patented not. 21, 1913.

6 SHEETS-SHEET 6.

- M 30 Kg 5b J. E. BELL.

GAS BURNING rummon.

APPLICATION FILED MAR. 15, 1909. 4 I

' Patented Oct. 21, 1913.

6 SHEETB-SHEBT 6.

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GAS-BURNING FURNACE.

Specification of Letters Patent.

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Application filed. March 15 1909. Serial-No. 433,&01.

To all whom it may concern Be it known that I, JOHN E. BELL, of New York, county of New York, and State of New York, have invented a new and useful Gas-Burning Furnace, of which the following is a full, clear, and exact description,

reference being had to the accompanying,

drawings,

My invention relates to the burning of forming part of this specification.

gases, particularly blast furnace gases, al-f be applied to producer gas,

the furnace above thefire grates, the gas and l air entering the furnace separate streams I and the air bein drawn in by the gas. In this case the gas burns relatively slowly and will not be completely consumed before the products come in contact .with the cool boiler tubes, after which further combustion cannot take place. Moreover, this method does not "utilize the full volume of the furnace gases. boiler arch and of course takes the shortest path from the burner outlet tot-he boiler, thus leaving a lar e amount of the furnace volume not'utilize the igniting fire is at from the entering gas, and consequently reignition after the flame onceburns out is not The gas streams along under the Moreover, in such case a maximum dIStELIlCB as quick or thorough as it would be if the grates were located nearer to the entering gas streams.

Myv invention is designed to overcome these difiiculties, to utilize more fully the full furnace volume, to mix the gas and air more thoroughly and to give the ignited mixture a circuitous passage over a heated fire brick of refractory material before reaching the pool boiler tubes. It is also designed to give the currents natural stream lines in even curves from the gas outlet to the boiler surface and give a long pass without abnormally extending the furnace.

Referring to the accompanying drawings, in which;

Figure 1 is a sectional side elevation of a Babcock & Wilcox boiler pro id with my is a front l improved furnace; Fig. 2

tion of the same, one-half being in vertical section; Fig. 3 is a horizontal section on the line IH-IH of Fig. 1; Fig. 4 is a view similar to Fig. 1 showing the same furnace applied to a Stirling boiler; Fig. 5 is a view similar to Fig. 1, showing another modified form; Fig. 6 is a partial horizontal section on the line VIVI of Fig. '5; Fig. 7 is a sectional view of a modified form of mixer on the line VII-VII of Fig. 8; Fig. 8 is a.

partial end view of the same; Fig. 19 is a partial sectional view of another form of mixer on the line IX IX of Fig. 10; Fig. 10 is a sectional view on line of Fig. 9.

. In the form shown in Figs. 1, '2 and 3, '2

represents the longitudinal steam and water drum, 3 the headers and 4 the water tubes of aBabcock '8: Wilcox b0 iler. Beneath and projecting in front of this boiler is the gas furnace having a front wall 5, side walls 6-6 and preferably an intermediate partition wall 7. 8 is a hollow bridge wall which extends transversely and divides the main furnace chamber 9' containing the grate '10 from the supplemental combustion chamber 11 beneath. the boiler tubes. The furnace arch 12 is provided with a portion 13 which extends rearwardly over the bridge wall and into the supplemental combustion chamber.

In this form the blast furnace gas is led down from a main through a depending branch 1 1 having a bottom portion 15 from the intermediate part of which extends the side branch pi es 16. These branches 16 lead downwar ly from valve casings 17, then. e laterally and are thence curved rearward y to valve casings 18 at the sides of the furnace chamber. Valves 19 and 20 are provided in the valve casings 17 and 18, each of these valves being similar and being shown in detail in Fig. 1. In the form shown, the valve stem 21 extends through the top of the valve casing and is pivotally connected to a lever 22 fulcrumed at 23 and having a pivoted screw-threaded collar through which extends a screw-threaded stem '24 having an actuating hand-Wheel 25 at its lower end. With this valve stem the valve may be set to its desired openings.

From the valve casings 18 gas conduits 26 extend downwardly and thence rearwardly and enter the ends of the gas tunnel 2'], which extends transversely under the hollow bridge wall and preferably has doors 28 in number may be used.

The ends of the air chamber 31 are provided with gratings 32 provided with sliding dampers orvalves 33 by which the amount of air entering each end of the hollow bridge wall may be regulated. The burners project forwardly, preferably with a slight upward inclination, and the gas and air is partially mixed in these tubes or nozzles which may be, of course, circu-- lar, elliptical, oval or any other desirable form and size. I prefer to use a series of relatively small burners so that the gas and air are distributed along the entire length of the bridge wall. The burning mixture in the front combustion chambers 9 thence flows upwardly and turns rearwardly through the throat 34, and under the rear end of the arch 13 which preferably has a rear depending portion 35, thence the mixture and products of combustion rise and contact with the cool boiler tubes.

In Fig. 4, I show a furnace similar to that of Figs. 1, 2 and 3 applied to a Stirling boiler. In this figure parts similar to those of Fig. 1 are marked. with the samenumer'al with the letter 3., applied. In this case 36 is the front upper steam and water drum, 37 the mud drum and 38 the bank of tubes of .the Stirling boiler. v

In Figs. 5 and 6 I show-a similar furnace to that of Figs. 1, 2 and 3, except that the air chamber 31 in the bridge wall is front of the gas pipe 27 and is provided with an upward extension 39 from which the mixer tubes 30 extend into the front combustion chamber 9". In this case again, the ends of the air chamber are provided with grates 32 having adjustable valves or shutters at the sides of the setting. Parts. similar to those of Fig. l are marked with the same numeral with the letter b applied. v

In Figs. 7 and 8, I show another form of gas nozzle by which the gas may be regulated at each nozzle. In this case the gas pipe 27 is rovided with a short branch 40 having a at valve surface provided with a grating 41. The flattened gas nozzle 42, is also provided with a grating or bars 43 and slides over the portion 40, being actuated by a pinion 44 on a shaft 45 extending through a rear extension 46 of the gas nozzle' and intermeshing with a rack 47 on the branch 40. The shaft 45 extends through the. side wall of the furnace, and by turning it the supply of air can be regulated by ,moving the tapered nozzle with relation to the tapered mixer tube 30 and the supply of gas may be regulated -at the burners, by opening and closing the grating.

Instead of mixing the gas and air in the nozzles extending through the front of the bridge wall, I may mix the gas and air in the hollow chamber of the bridge wall itself. Thus, inFigs. 9 and 10, 8 indicates the hollow bridge wall having in the. side walls at its ends the mixing tube 48. Into these tubes extend the gas nozzles 49 of smaller size so as to induce air around them. In

this case the downwardly-extending gas chamber 3]. of the hollow bridge wall and thence flow forwardly through the openings 30 tothe main grate chamber in front thereof.- Otherwise the arrangement will be similar to that of previous figures.

In the use of my improved furnace the gas and air mixture will flow through the bridge wall forwardly into the rear portion of the grate chamber. The mixture will at once ignite in this chamber and will then rise and. be turned backwardly in a general horizontal direction uhderneath the overhanging arch. It will flow rearwardly under this arch until reaching-its rear end,- thence it will thus rise again with an upward bend and contact with the cool boiler surfaces.

The advantages of my invention will be obvious tosthose skilled in-theart. A long circuitous path is given to'the mixture during and after ignition, thus getting more complete combustion before reaching the boiler tubes, and without abnormally ex tending the furnace. The burner openings are at the back and directly over the fire grates so that the mixture will bereadily ignited. The mixture will flow in natural stream lines and even curves from, the

burner outlets and will traverse substan:

tially the whole furnace volume, giving a very long pass. to the boiler heating surface the gases are compelled to make two complete substantially right-angled bends which will insure a thorough and complete mixture of the gas and air. This, especially in conjunction with the sweep of the mixture through substantially the entire volume of the furnace, will insure a very complete combuss From the burner outlets' tion with a minimum amount of air supply. As the gases sweep over the fire brick sur- 1 faces of the furnace and throat, these surfaces will be kept at a high temperature and combustion will take place under the best conditions with ample time for completion thereof.

lhe gas and air may be separately controlled from the outside of the setting, or the air and gas may be controlled at the I burners themselves, the manner of introduc there being a combustion chamber in front,

ing and mixing the air and the gases may be varied and many otherchanges may be made without departing from my invention.

What I claim is I 1. A gas furnace having a front combustion chamber with a rear bridge wall, an air chamber in the bridge wall, a plurality of mixing nozzles projecting forwardly through the bridge wall from the air chamber and opening into the combustion 'chamber, a gas supply pipe, a plurality of gas nozzles leading from the gas pipe, each extending into a mixing nozzle, a refractory arch extending rearwardly from the combustion chamber over the bridge wall, means for supplying gas to the gas supply pipe, and means for supplying air to the air chamber substantially as described.

2. A gas furnace having a bridge wall,

of the bridge wall, said bridge having an air chamber extending the full length thereof and opening to the atmosphere at both ends, means for controlling the supply of air to the air chamber through said openings, openings leading forwardly from the air chamber into the combustion chamber,

means for supplying gas to each opening, and a refractory arch extending rearwardly over apart of the bridge wall; substantially as described.

3. A gas furnace having; a heating chamber, a plurality of combustion chambers, a

hollow bridge wall forming an air chamber,

a plurality of openings leading forwardly from the air chamber into each combustion chamber, means for supplym air to said chamber, a gas nozzleextendlng into each opening, and a refractory arch extending rearwardly over a part of the bridge wall and forming a throat before the gases rise into the heating chamber; substantially as described.

4. In a gas furnace, a combustion chamber having a hollow bridge wall extending bustion chamber, gas nozzles extending through the air chamber into each opening, means to supply gas to each of the nozzles, means at both ends of said chamber to supply air thereto, together with means to regulate the flow of the air, and a rearwardly extending arch above the bridge wall arranged to give'two substantially right angled passes to the airand gas Within the combustion chamber before passing to the G. A gas-fired furnace having a heating chamber, said furnace having a front comheating chamber; substantially as described.

bustion chamber with abridge wall at its I rear, an air chamber in the bridge wall, a

plurality of mixer tubes extending forwardly'into the rear portion of the front combustion chamber from the air chamber, a gas conduit having a plurality of branches each extending through the air chamber into one of the mixer tubes, a refractory arch extending rearwardly over the bridge wall and arranged to give two angular passes to the gases before entering the heating chamber, and mechanism for regulating the flow of air and gas; substantially as described.

, lln testimony whereof, l have hereunto setmy hand.

- v 'JJQHN E. BELL. Witnesses:

M, WINTER, G. K. WANNEMAGHER. 

